Observationally, Google search and Kagi are fundamentally different business models.

Google followed/trailblazed the "enshitification" arc of providing a free service that sees widespread adoption by the public, and then financially exploiting the widespread adoption by leveraging usage of the service to serve ads like in the screenshot.

Kagi is a subscription service you pay for and they generate their best effort at an ideal service for you using the money you gave them.

The Google model of providing a free service sort of requires that it be enshitified in order to close the circle on the business case. Reliance on VC money in this model is likely a further aggravating factor to aggressively exploit usage of the service once widespread adoption is achieved.

The Kagi model has an opposite pressure, where if it tries to exploit adoption of the service in a way that users don't appreciate, users will simply abandon their subscription, putting a core revenue stream the business has built itself around at risk.

Is it possible for Kagi or a business like that to become shitty? Sure, a new manager that misunderstands core realities can show up anywhere and ruin the business, or sagging business financials could require VC injection which then pressures further financial extractions from uses. But the structural pressures on a Kagi-style model certainly seem to steer it in the right direction when Google's structural model invariably steered it into something that becomes less pleasant than we all initially knew.